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Income Taxes (Schedule Of Effective Income Tax Rates) (Details)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Effective Tax Rate [Line Items]
Income tax rates for continuing operations	12.70%	39.00%
IPL [Member]
Effective Tax Rate [Line Items]
Income tax rates for continuing operations	(24.00%)	125.40%
WPL [Member]
Effective Tax Rate [Line Items]
Income tax rates for continuing operations	32.00%	44.10%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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